Stump Measurement
Low Side
Step Height ″
If wedged,
show wedge
marks
DIA
15
BC
10
UC
5
UC%
Opening ″
SCORE
High Side
Step Height ″
Faller Name
•
•
FALLER
STANDS HERE
•
•
NOTES:
Measure in inches
Backcut measured from
wedge placement through
the holding wood
UC ÷ DIA = UC%
Circle the score
Revised March 2006
Items/Comments:
Undercuts &
Backcuts
* Note: If the faller
determined that the tree had
to be wedged the undercut
depth should be ¼ of the
tree diameter.
*Note:
Timber 60 inches or more in
diameter can have the heart
wood cut out of the stem,
but holding wood must be
maintained on both corners
of the stump to maintain
control of the tree.
Marking Conditions

E 15 Preferred undercut and backcut are straight & level and completed from high
side. Preferred undercut selected for: wedging, timber type and terrain. Undercut
is cleaned out and is the preferred percentage of tree diameter. The undercut
opening is of the preferred ratio for the type of undercut selected. Holding wood
and preferred anti-kickback step are maintained across the entire stump. (see
table below) Also see *Note.

14
Preferred undercut and back cut are straight & level and completed from high
side. Undercut is 1/3 of the tree diameter and is angled to ensure that the
opening is at least ½ the length of the top cut. Undercut is cleaned out. Holding
wood is maintained across the entire stump. Also see *Note

13
Meets acceptable standard and depth of undercut is 1/3 tree diameter. Holding
wood is maintained across the entire stump. Also see *Note.

A 12 Acceptable standard: Includes appropriate undercut and backcut are
completed from high side, are slightly off level, depth of the undercut between
25% and 40% of the tree diameter. Undercut is cleaned out. The cuts forming
the opening of the undercut are 1/3 to ½ the length of the top cut. Backcut is
slightly above the undercut, slightly off level. Holding wood is preferably
maintained across the entire stump but at minimum must be on both corners.
Also see *Note.

3

U 0 Unacceptable: Fails to meet the acceptable standard, undercut 50% or greater of
the tree diameter, no undercut, dutchman, backcut is below undercut, holding
wood is cut off. Tree splits or barber chairs and there is excessive slope from
back-barring.
*Note:
Short stubbys can have an
undercut up to 50%.
*Note:
Reference Info Flips.
Total stump points
divided by the number of
stumps assessed=mark
awarded
Undercut is off level, not cleaned out or corrected, too deep or too shallow over
40% or less than 25% of diameter opening is less than 1/3 the length of the top
cut. Backcut is flush to undercut – no step. Excessive holding wood left on the
low side of the stump.
Anti-kickback Step Reference Guide in Relation to Stump Diameter
75% of the anti-kickback step must be within the preferred height tolerances, as listed below:
Humbolt, Swanson undercuts
Up to 36” (3’-0”) diameter
48” (4’-0”) to 60” (5’-0”) diameter
72” (6’-0”) to 84” (7’-0”) diameter
96” (8’-0”) to 108” (9’-0”) diameter
120” (10’-0”) to 144” (12’0”) diameter
156” (13’-0”) diameter and above
Conventional and Pie (frozen wood) undercuts
Up to 14” (1’-2”) diameter
16” (1’-4”) to 36” (3’-0”) diameter
48” (4-0”) to 60” (5’-0”) diameter
72” (6’0”) to 84” (7’0”) diameter
96” (8’0”) to 108” (9’0”) diameter
120” (10’-0”) to 144” (12’0”) diameter
156” (13’-0”) diameter and above
E - excellent, best practice
Preferred anti-kickback step
¾ - 1 inch height difference
1 ½ inch height difference
2 inch height difference
3 inch height difference
4 inch height difference
6 inch height difference
Preferred anti-kickback step
¾ to 1 inch height difference
2 inch height difference
3 inch height difference
4 inch height difference
6 inch height difference
8 inch height difference
12 inch height difference
A - meets the acceptable standard
eval_BCFallerTrainingStandardFieldExam-pg21.docx
U - does not meet the acceptable standard
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